Parkour type game

I want to create a first person parkour game, but I have no clue how to do so, I've been messing with unityscript and many tutorial on youtube and such, but I want to make a game that is mine, not a game I simply followed a youtube video of. Anyways, how would I have it so that if the first person controller is against a wall ( I will be using the first person controller), and when I press space the camera does like an animation making it look like the character was doing a vault over like a barrier or something.

Things that have to be true = the barrier has to be a certain height, and the W key has to be pushed down.

anyways, Im asking for any tutorials or such that could help me. Anyone know of any simple beginner raycasting tutorials? because I think thats what I need, im not sure. Thanks